**Sanitary sewage**

Sanitary sewage refers to the liquid waste that originates from residential and industrial buildings. It includes the wastewater generated from activities such as bathing, washing, toilet flushing, and food preparation. Sanitary sewage primarily consists of water, organic matter, and various pollutants.

**Explanation:**

Sanitary sewage is the correct term for the liquid wastes originating from residential and industrial buildings. Let's understand why the other options are not correct:

a) Domestic sewage: While domestic sewage is a term that is often used interchangeably with sanitary sewage, it specifically refers to the liquid waste originating from households or residences. It does not include industrial wastewater.

b) Combined sewage: Combined sewage refers to a type of wastewater system that carries both sanitary sewage and stormwater runoff in the same pipes. This type of system is commonly found in older cities where a single pipe system is used for both types of wastewater. However, the question asks for the collective term for liquid wastes originating from residential and industrial buildings, which does not necessarily imply a combined sewer system.

d) None of these: This option is incorrect as the liquid wastes originating from residential and industrial buildings do have a collective term, which is sanitary sewage.

To summarize, sanitary sewage is the correct term for the liquid wastes originating from both residential and industrial buildings. It encompasses the wastewater generated from various activities and contains water, organic matter, and pollutants.